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1 Power Supply, Overheating components, Voltages Out Of Spec.
The power supply in my Marantz SR-92 Receiver is way out of spec, I need to figure out why, at the 20v side iam getting 30 volts at the 24 volt side iam getting 28 volts, this is causing a mosfet to cook and it is also causing 4 transistors to cook, ive replaced them, it works but they get scary hot, I replaced 2 ceramic disc caps on the psu along with a resistor, This model is a exact twin of the Carver 895 receiver, Please help. This IS one a regular 120 volt ac line.
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The high voltage tag should be reserved for >110V. I understand that the voltage in your power supply is high, but that tag means "Above normal mains voltage". Typically 400V+, like you find on most US Navy equipment.
- de Dave
You have either a zener diode out of spec, or a resistor out of spec. Without a schematic it is nearly hopeless.
- de Dave
http://www.manualsnguides.com/results.ph... was No Help.
- de Dave
Is the SR-92 the same as the SR9200?
These guys will sell you the Service Manual for the Marantz SR9200 for $20 in PDF format. That includes the Electronics Schematic(s). Just schematics runs $15
http://www.manualsparadise.com/ShowProdu...
Make a note of the Service Bulletins, including the Firmware Upgrade! They might also be worth having to keep your antique tuner/amp in top condition.
Where are the schematics on ifixit.com???
- de Dave
There is no firmware on this, its not the same as the 9200, A Carver 895 is identical, I do have a service manual for it , i nearly replaced everything on the psu circut board and iam still having issues.
- de Rob
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